Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b993448d3b209652e6c75c344eb9f906d6fa926a428bcd0c071e6bf7398b9e4f' 
  AND token = 'dMyuPuhTC9nj3zeFt1SlgsYvdvZubX6WyqdHz0W5B3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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