Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f0bda2274f3c418d088fcecadf8ea8519ee2278a427795a5f87d73943c7de1f' 
  AND token = '+cCdmEUUCAYYMheKLZlbkHSjIQPT3cK7tMQ851FyC0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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