Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3c32ebcbc8140a4a02651a060fd313e8d729119545fa7c16ff7ee413173f93' 
  AND token = 'cjdPa4VmpyOcId5SbQgs3dW94YfBYXjw3PtQgx5qEsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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