Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e04aa58c3bafb4ff53e2e539c992a35c52a9a25da4cde1af0d9422c29a687ae' 
  AND token = 'jarrkyFcYLAzV5CLBj5rbVvg+1CBfcWxEHsGMQP0570=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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