Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a705992ea2ef7c26c5a6aea7f8cc70998c3bc86d120fe11a71dc565d498ed8' 
  AND token = 'zK6+G3/aSo8hDNr5oGkYv1qTyvhrix7CaarqXZng6ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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