Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71ec643f8ee154cb9ef40a07cfd206570663e3d73bdc08e52b1b0404b97d40f6' 
  AND token = 'lqvCxSnw2CgZeZ6LVwyRcfVo4b1cWuf2hbwieaFrSoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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