Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce7ee2a0f488c3ffa2cea517b5b27c8acf4871489971c13e9e3080166ba5edb' 
  AND token = 'qVw3K4bu95w+8bGYdgQAjFoLX7IxzSykTaDm016Ag58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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