Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a88f4d6653f97bece8e2d140fd45ccfaf9fbc69a59bb21f541e07aaf82e15b8' 
  AND token = 'c8ohnyTxKxEFPYzP06YQu3baaleZ8h7WkwjDyh9E6+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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