Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de99cf3b12a7952b7ad3365abad9acde725885801f395d6020cb4bb04e9ef9c5' 
  AND token = '3/QfnrLBltCn9PytMQQVRDh1vmRAwS5J1OSVMdwyqIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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