Joining cobk and coep table using Inner join taking too long

I am placing an Inner join on cobk and coep table to get data in an internal table but it is taking too long. I also tried to get data from db view COVP but it is also taking long time.

SELECT bk~kokrs

       bk~belnr

       bk~budat

       bk~cpudt

       bk~bltxt

       ep~buzei

       ep~wkgbtr

       ep~objnr

       ep~gjahr

       ep~kstar

       ep~vrgng

       ep~parob1

       ep~beknz

       ep~sgtxt

       ep~objnr_n1

       ep~bukrs

INTO TABLE covp_itab

FROM cobk AS bk

INNER JOIN coep AS ep ON (bk~kokrs = ep~kokrs AND bk~belnr = ep~belnr)

WHERE bk~kokrs     = co_kokrs

AND   ep~wrttp     = '04'

AND   ep~kstar     IN s_kstar

AND   ep~vrgng     IN s_vrgng 

AND   ep~bukrs     IN r_bukrs

AND   bk~timestamp IN r_stamp.