SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '054355581d13128b07dc3ba01eab3d001f7fc1ec14873cdf7cfbf40198b85a22' 
  AND token = '/q8ZqashRX5KORZzwAW1PcwVfZ9KhYqzo2E3N7/VlW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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