SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5faaac8ea261ed45b9391b5200db34268c8160b3363afcfead497411e8f9f02c' 
  AND token = 'C1HPYzMQYRRx5jSKBXJzpNhoLK+XEXklvflQFiuF1aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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