Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91086ddba0e5167c46a7503c78b117e052daa83e6894f0f8abe5c87b0eee27ed' 
  AND token = 'eMB/NeOoJZCy3yrzY8tqRGRqbz0w83ww406YgKFzWtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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