Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0639bf50206394fba5a0b3c7dfec6b564ededf4cc76080c3debeedb2de655943' 
  AND token = '5z/wnxIBTnM//uL44leR5ybZnexT6nYNiDadx/Uy0BI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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