Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2ecb2a785dead7fe8543115eed77b915666b36a93604cb02ebcf6fb1f4573b' 
  AND token = 'E39wZF4TH6wW12cyfI9Hsale9ogStkvP/KuPfyksylU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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