SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eb1a06419b3ab24ff19c0020a6d5d129955bec34479fd833773fc91c7493b26f' 
  AND token = 'Fa9wEntZSu1BLpPyrYoVTevtyGxoeH/Z6EldGe9KVik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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