Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98a71d55e82278245954b1e6d24d314cfcf4547049f728b80f5122e07cfa087' 
  AND token = '/0NxkbkT/Vm5OKR/ZTQ8I6S4uoL+uzNNDGDMcIoLm6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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