Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1859fea13ab9a33cd43ff0d3e43734659019cf1fe62d37ad63f6fa4cffb2d4' 
  AND token = 'VzaBE0hgT0HjfQvW8X5D+arAPBkuzVclf/2ED+XCL6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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