Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5eb964e0419ae25409fd874dcfc8ff64a773d24ebfcd418705f999127ac4bde' 
  AND token = '6j1oWpAx6+hEeS5yFfFj+UXoY5GdYhZYhf1JZqnXX2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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