fold. If UTG = super tight, he must have some kind of a strong hand here for just calling and calling. AA or AhKh? You can't raise here because UTG will call. I wouldn't be scared of small blind here, I think it's an attempt to either buy a free card on the cheap here most likely), but you are probably beat by UTG. You are facing 2 players here. I don't think top pair is good enuff against 2 players. in this situation. I'd fold and probably this thing will go to showdown, so you can take notes fort the future on those 2 players.

BTW : I check that flop when both checked to me.