Query - delay 20 segs

[Ricardo Takemura]

Hi people,

I have 2 tables "sector" (sector_id, expired, updatetime) and "product" (product_id, sector_id, name, price, currency) and for each have 80000 rows.
I'm doing the follow sql instruction:
select * from sector, product where
sector.sector_id=product.sector_id and
sector.expired='0' and
sector.sector_id!='365727' and
product.price*product.currency>'658997000' and
product.price*product.currency<'659003000'
order by sector.updatetime
desc limit 5;
This sql instruction took 20 seconds... Could you help me to improve its performance?

Thanks,
Takemura.