10cent/5cent was much different than 6cent/3cent and 2cent/1cent when I first joined the games. The players do not fold as much and at times you'll run into games with overly aggressive players. The way to win is to tighten up and only play good hands.
Opening up UTG with KQo isn't really a big problem, but calling a 3-bet is. I would suggest opening tighter than this. Something like 44+, AJs+, AQo+ UTG which is 7.69% of hands. If you get 3-bet fold. If you have KK+ you can 4-bet which is .90% of hands.
Wait a minute, other people are printing money off of you, because you keep folding to their 3-bets right? Well yes, but when you 4-bet they won't have the discipline to fold and you will well make up for all those folds when they flat your 4-bet with QJs and call off all their money on KJ4r flop.
You don't ever need to 4-bet bluff to be a winner at 10nl. There are few opportunities where it is good, but you can pass these up and still be a winner.
Also, don't convince yourself that you are entitled to the pot just because you had a stronger hand preflop. AK use to be a losing hand for me, because I always c-bet the flop with it and would get stubborn and make losing bluffs with it when it missed. Realize this, "I had a better range than my opponent preflop, but these cards on the flop have made my hand worse than his so I am just going to check/fold, because his range hits it stronger and he doesn't fold enough."
Sometimes you can fire at flops with air, but you need to be way more fold happy than calling with K high. If you face overly aggressive opponents that don't stop betting, catch a hand and then put up a fight. Sometimes you can just call them all the way down and you can watch them empty their wallet on you. Try not bluffing
for awhile and see where that takes you. Most won't even catch on. Yes, the internet says c-bet with 70%+ of hands in heads up pots, which is true for the most part. But if you are against a player that won't fold and will always re-raise you, stop doing it. Only do it with a good hand and don't be afraid of calling him down. K high is often too weak though. You need something stronger.
It may feel like your opponents are being really aggressive, but sometimes this is actually your imagination. You should open up a word document and count the number of times your opponents re-raise, call, and fold to your c-bets. You'll be surprised how much they actually fold at times. You are probably losing most of your money by fighting back when you don't need to.
You donk bet the flop in your example, not c-bet. There is a difference since you were not the aggressor preflop.