Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b66e7b32a1858dc8eafccf82244a1015166d9674a584970e7e995b5248f5fc' 
  AND token = 'eGVRGVGzYG1B672ykdhN34LvkCT6VlJBP9jVosnn1uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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