Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31059ee897f160fa49344247b89ac833abe425f015752ce832d8c37065e8c24' 
  AND token = 'OHqX4tMZgBOs9c8A7zqcBVjmRv5osRJy9MzIob5qrfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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