Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad0d86c43be1c565576c74c0356ffb006f43613105e8f90ab9673349122c44b' 
  AND token = '/aWsr6ENnDZQeXn3G3DP+VSh4H8kJguGfjqRIsirADI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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