Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e4e084fe824998c86fc034602d8e1fbfaa795c923cc364362e96092c53c685' 
  AND token = 'QdXUGrm7CbYb6hhZMhqdGdYawTK82FT8MuWhlO32CZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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