Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42cb9a94f89a88660ef64c9c7c09f351ed7569cf1ffa0cabdaf2acf5fac6aa5' 
  AND token = 'plWY5FYITiD2ze2rC36GEoXy0cBnkosSkkIHevNin8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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