[1564612763]: 1564612763 is the epoch (seconds since Jan, 1st 1970).
You can use PHP:
echo date( 'd/M/y H:i:s', 1564612763 );
Or the date
shell command:
$ date -d @1564612763
[0.00167]: Time to process the request.
[www.xxxxx.sk]: Hostname.
[#5571473]: Incident ID.
[0]: Rule ID (if any).
[1]: Log level.
[163.179.32.214]: User IP.
[404]: HTTP code returned by the firewall.
[GET]: HTTP method.
[/wp-login.php]: Requested script.
[Blocked access to the login page]: Reason.
[hex:626f7420646574656374696f6e20697320656e61626c6564]: Additional info, hexencoded. There are many websites that you can use to decode strings: https://www.rapidtables.com/convert/number/hex-to-ascii.html