Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c57e339de83c9e7740c6ef6e73a5e03b6a6728355f2772eee35815bec7200f' 
  AND token = 'EfjYRaNWysxC+O7Rf0JbBI+iRQz9NohCv3029L2Ws5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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