Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3023790af83f9eb874ef1a9344951098139a1823406aa8aa8c4f8b7fa6e8c968' 
  AND token = '4HoViv5LUdwaz5H5NDkenpNPWX+iYBqa0RODAlFtDkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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