Ok, I know similar questions have been asked before but none of the answers I found seem to work.  Here's my code:

    $sql = $wpdb->prepare('SELECT ID FROM ' . $ignore_url_table_name . " where url LIKE '%%%s%%'", $urlRequested);
    $wpdb->get_row($sql);
    if ($wpdb->num_rows > 0) {
        return;
    }

Here's the problem:  I'm trying to detect when a specific string is found in the URL.  One example of the url in the talble to look for is: 

doing_wp_cron

An example of the $urlRequested is:

doing_wp_cron=1543678213.5953478813171386718750

The above SQL statement doesn't find a match.

I've also attempted to use 

    $sql = $wpdb->prepare('SELECT ID FROM ' . $ignore_url_table_name . " where url LIKE '%s'", '%' . $wpdb->esc_like($urlRequested) . '%');


This appears to turn the doing_wp_cron into doing//_wp//_cron which the query also doesn't find.

What am I doing wrong here?

Thanks