Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a149284a397446867ab028713826237a7029cb032ced550d820414b38e9cf7' 
  AND token = '98OBl6jPSO7IeoZwF6ovtBquGOxXp4hf3ujmiL/6nDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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