Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b6d3ac9a584338ff0dcca2b68a54261636bcbbcebf487e52d93e9d0ed8eca81' 
  AND token = 'I7ENuJKeXGvZcUfgjQFGlkUF6Hn2rqmLExm96F96XGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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