Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def259e5dd73ccc2f7706e42b252bde93246a91b4b318cf38a0f6e74ee1cd123' 
  AND token = 'ZpY8aKqaNupMa4B6WDHAGkyI+8bze9hrAn4+kni1Lmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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