Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffec6b2eeefc0f3b40723b5405c7b39fe7a445be95a4e40b61fbbecabf2b3e65' 
  AND token = 'N4zOxUYwRbJe64/BI2YDT3gaIOW+bgurDMwuy+siQ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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