This works for me to find queries on any database in the instance. I'm sysadmin on the instance (check your priviledges):
SELECT deqs.last_execution_time AS [Time], dest.text AS [Query], dest.*
FROM sys.dm_exec_query_stats AS deqs
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handle) AS dest
WHERE dest.dbid = DB_ID('msdb')
ORDER BY deqs.last_execution_time DESC
This is the same answer that Aaron Bertrand provided but it wasn't placed in an answer.
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