SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57c59df2fe7412536dc5acb35a96819da90d1c84202335a31ba16c48573952e0' 
  AND token = 'wIDZ/hVnxtiE49zmgIFLsnfS3mjUFH+oJAqQ97NI2Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}