Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '761214a1c4b3e0282c1c636b8ab57bef859d2b22d8b4e6d81d449d7017b48f20' 
  AND token = 'MNNsMuBBVgDFmNX5tht4SQSXZD46qDF6vCPIcMSd/uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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