Di solito sarebbe questo:
SELECT *
FROM yourtable
WHERE yourtimetimefield>='2010-10-01'
AND yourtimetimefield< '2010-11-01'
Ma poiché hai un timestamp Unix, avrai bisogno di qualcosa del genere:
SELECT *
FROM yourtable
WHERE yourtimetimefield>=unix_timestamp('2010-10-01')
AND yourtimetimefield< unix_timestamp('2010-11-01')