Information on villain as well as your table image would help.
That flop bet looks like a blocking bet but if they are on a flush draw, you have the Ac so that means they would have called the preflop raise to 5x bb with KcQc at best so I don't really think this is the case. Furthermore, they called with about 1.8:1 pot
odds which is quite bad for a flush draw.
A more likely holding is a medium pair. That min bet could just be a test bet. Although I wouldn't entirely rule out trips, calling 5x bb OOP with 33 is quite bad. If they have 88, well... you're out of luck.
I guess it depends on the overall stack sizes and stats on villain, but 98s or 87s isn't entirely out of the question. Calling a 5x bb raise with A8 is terrible because there's a good chance, you're dominated by AK or AQ.
I think you're ahead here but I would slow the turn to be safe.