Are my seeds still OK?

I've put seeds to germinate with paper towel method in tupperware
and I've put it on my heater that was over 40 C (108 F) just for half an hour
and it was really damp and hot inside when I opened tupperware,
I've let it air out to get fresh air,put few drops of fresh distilled water and now it is on 26 C (78 F)
by your opinion are my seeds OK?
could have that 30 min destroy them?

No. Or possibly yes.

When I visited large scale nursery production facilities they definitely only use distilled water to touch the 100,000 seeds getting planted each day. It has a huge effect on germination rates and seedling success.