Setting a default TTL of 1 second does not allow for proper caching and can put strain on the DNS network. The "best practice" is between 12 and 24 hours, but if that's too long it might make sense to follow Cloudflare, which sets their "Auto" TTL to 300 seconds (or 5 minutes)1.

In general, it's good practice to have a slightly longer TTL to enable faster queries2 and better redundancy.