Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e547e3f7c3cbe9b81872932bb9d0ae2cfe8d7745b41c66deb404cae6f8dd73be' 
  AND token = 'IozkMU/d5u9qqdbc89ckSJPfBywLo61Y6ElJ+U44sE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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