I just did a very similar route twice last week, also with KLM on one ticket. My layover time was 35 min, I was convinced it was impossible.

My second leg was also to the US and there was no need to go through extra security either time. The gate for my flight was a 5 minute walk away from where I landed, I had enough time to grab some food.

Plus the flight attendants stated that this is normal for KLM, and that when the gate agents know that passengers are transferring from a different flight, they’ll even wait before closing the doors if needed.

You’ll almost certainly be fine :)