* * * * * php /var/www/vhosts/example.com/httpdocs/bin/cli.php demo:command -q
or
* * * * * cd /var/www/vhosts/example.com/httpdocs/bin && php ./cli.php demo:command -q
Adapt the command to your specifications by replacing example.com with your domain name.
Note the -q (or --quiet) option at the end of the command - it serves as a flag to inform the Application that no output should be returned (unless it's an error).