Thanks folks.
I've seen a couple posts online where people have created playlists placing that track between 'Escape' and 'Moonage Daydream' also, but I've watched that part of the film (escape from the Kyln to arrival at Knowhere) carefully, and it's definitely not played at that point.
However, I could see it as being appropriate for Quill's flight from the Kyln to the Milano, so I'm going to guess that it was written for that scene, but Gunn decided it would be better to continue playing 'Escape' instead, so the track was dropped.