Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd904949b5aa041c1896abf9c1c4525475f5b64387feb00f0cb7f9074ebd5856b' 
  AND token = 'h9WqSnElV5dWl5UdpKExwdXBeu+RIo4I9TJiztxO/Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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