The audio track you are looking for is titled by Ahjay Stelino , which is track number 748 in the Mixkit library.
You can download it directly from the official Mixkit website: Track Details: Artist: Ahjay Stelino Mood: Relaxing, Peaceful, Calm Download mixkit relaxation 748 mp3
Mixkit Stock Music Free License (can be used in YouTube videos, social media, and online advertisements) The audio track you are looking for is