Normalt vil det være dette:
SELECT *
FROM yourtable
WHERE yourtimetimefield>='2010-10-01'
AND yourtimetimefield< '2010-11-01'
Men fordi du har et unix-tidsstempler, har du brug for noget som dette:
SELECT *
FROM yourtable
WHERE yourtimetimefield>=unix_timestamp('2010-10-01')
AND yourtimetimefield< unix_timestamp('2010-11-01')