Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391a49bb7f9b6199eace71e4f4f9773312a10848d5704f52109b41d4c42a4faa' 
  AND token = 'I9jCX3ZXvO/PtAi7E1YiHvDYmI3musg5Hm91vlhwA28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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