Navigate to => system => Scheduled Cron jobs tab and paste the below command in the command input box. Run it as root and schedule the minutes as required.
Move it up the list to give it more priority. Please note replace with the xxx to your environment.
/usr/bin/env PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin COLUMNS=72 /usr/local/bin/drush --root=/home/xxx/public_html --uri=http://yoursite.com/cron.php?cron_key=xxxxxxxxxx --quiet cron
In my case it did not run on schedule. If that happens restart you server. It should work as intended.