Is 1-hour layover at Doha Airport too short for connecting flight to philadelphia ?

I am going to philadelphia from Kolkata with qatar airways. When I booked my tickets there was a. 1hour 30 min layover. But suddenly one day they changed it to just 1 hour only. I am afraid that I might miss the connecting flight. Reason what I think is Hamad is a very large airport and flight to USA need an additional security​ with gates closes 20 min earlier of take off. So I have to go through 2 security​ and reach to gate 20 min early. Is not it too hectic and short ?

Can anyone suggest what I should do not to miss the flight?

The only good thing is as it is a single ticket by qatar airways, I do not have think for baggages. Still I am little worried.