Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4a0163e2453b7f921cc0ff83d7627684e8381a3989faeb76e4de00338b0343' 
  AND token = '1FNbI1GLOuuJtP7w9tgWUSgI9XaoJnpyrjcVRHU+kWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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