Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a297cc13b642283a7151c5d4fd30c818a4bcc4962b7fd1ea6f4f593d871b5847' 
  AND token = 't0e2mf5mVkw+qEMe+6gu5rG+bTEw5nkUqeXtQN0MDts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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