Currently I using following query:
SELECT
 ID,
 Key
FROM
 `mydataset.mytable`
 where ID = 100077113  and Key='06019'

My data has 100 million rows:
-----------------------------

ID - unique

Key - can have ~10,000 keys
---------------------------

If I know the key looking for ID can be done on ~10,000 rows and work much faster and process much less data.

How can I use the new clustering capabilites in BigQuery to partition on the field Key?