Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '376d9c4e1b97cd2a19288c674893232c34740b21626763823ce55287bcaccb12' 
  AND token = 'D2NPSem2Zk/nNRdzna1fUc55Ivz7RsK92qJgmckV5Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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