This file is indexed.

/lib/systemd-cron/boot_delay is in systemd-cron 1.5.13-1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/usr/bin/python3
import sys
import time

try:
    delay = int(sys.argv[1]) * 60
except:
    sys.exit("Usage: %s <minutes>" % sys.argv[0])

f = open('/proc/uptime', 'r')
uptime = int(float(f.readline().split()[0]))

if delay > uptime:
    try:
        time.sleep(delay - uptime)
    except KeyboardInterrupt:
        pass