Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63b42dd9c1d4e17d300698bc5bcdb4b7cbecfba84f00ff96b5b4b54c75d5232' 
  AND token = 'zbP05ark1pZUa5RQjy8LzgPm/7E3rrlpIlzfmZJSv0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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