Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6f3da97cf05100cb8ac9d2a21eded940d659bb7d70ff19ba2bd82a1afd2325b' 
  AND token = 'RPzAqxo5hZ47NPDTOwCWUIV4OpPPnCSzggwU3d30CZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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