The syntax matches log messages generated by
sudo, but if you are viewing it from
systemd's journal files, then it might not have the normal syslog-style
<timestamp> <hostname> <program name>: prefix.
The journal files are in a binary format, so they're best viewed using the
journalctl command or some other
systemd-specific viewer. If you just look for text among the binary data, you'll miss the timestamps and other important metadata.
Assuming this is in fact generated by
sudo, it would mean that user
anthony had a session running on a pseudo-TTY
pts/10 (= might be a terminal window in a local GUI session, or e.g. a remote SSH session),
cd'd to the root directory, and ran a command
sudo find / -name *systemctI*.
last anthony | grep pts/10 might give you more information on whether the session was a local terminal window or a remote session, and when the session might have happened. If the 3rd field of the
last output says
:0, then that is a local X11 GUI session; otherwise it should have the source IP address of the remote session.