Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6daeaeb4279f644aafa62a3fd421fb0e08772ea3164e45b0d78136c1cf3e06' 
  AND token = 'ho040FYYOgfHj2Hpl5XxYdZRDVJ2ds4CLelwIeHS+1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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