Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b942ad952e0de0d79013a2126baccbc85cc55d8f2db0946bca53b34583924929' 
  AND token = 'fbSaeLpkkmu9PWu5dFL3VIpGXdtwByq8ZNaewExt2Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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