Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd8d7da6dfeec32c97ceed75ef5c2d9c4c10035c976c50f0a64a2a79edeaa7d' 
  AND token = '5a8pVNBWcEpQjN7jYY4UWYTC2onjec/y1EBAZLMHgzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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