Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347f540b60018b74b7b13ec27ca8d7e12fcbbceaedc2aaba016df20430ebee0d' 
  AND token = '7HUEuazMQzH8hhlWjmZzbqF8l08KM+GmOIgjIy9qrkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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