Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb1203d6a23fbc0c369c2b5b6cea0cfdd35440f3fd9b3a5237ad4cf31f57855' 
  AND token = 'kf6yagPwn3D+UGdSpWG3BbRfOiA1/i6N7OqX2UMmo/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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