Fold KK? In a CASH game? Preflop?
There is an old guy who plays at my not-so-local casino card room. I know, from playing with him a few times, that he ONLY plays AA, KK, QQ, AK.
Other than THAT guy, why would you ever fold KK pre-flop in a cash game? The scenario the OP outlined is what you are playing for: only ONE (1) possible hand has you beat.
Heck, I'd be glad if 2-3 more went all in ahead of me.
If you won't play kings against an all in, then you're playing 'scared' and the table knows it.
Your call is a long-term +EV, so like the pizza guy says, " DOOOOOO IT!"
(my gf says it a lot too)