You want get_row. Per the Codex:
Get all the information about Link 10.
$mylink = $wpdb->get_row("SELECT * FROM $wpdb->links WHERE link_id = 10");The properties of the $mylink object are the column names of the
result from the SQL query (in this example all the columns from the
$wpdb->links table, but you could also query for specific columns
only).echo $mylink->link_id; // prints "10"https://codex.wordpress.org/Class_Reference/wpdb#SELECT_a_Row
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