Cron node executes the workflow every 10 minutes. Note that if you change the Mode from "Every X" you will need to manually update the Date & Time node to subtract the interval you are using.
Set nodes set the required values (name of the Slack channel, name of the Twitter account to search for, the tweet text and URL).
Date & Time node subtracts 10 minutes from the workflow execution time.
Twitter node gets the latest 50 tweets that mention the specified account.
IF node filters tweets posted in the past 10 minutes.