Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c027dd91765452858651a9e2c6aec124f3454b457ebf15ecfe1714e742272c61' 
  AND token = '0h4K9zww7BSpx8D8U52vczFHQYUKiNpN2iYj/zJxq9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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