Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10df5e77b787a29a657237784595cace97dffc8c56a40c49621dcefff64e735' 
  AND token = 'yYMSjKBmruLmVK16tsjr70wNujNs/uvps6FIgLM5trE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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