Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd768b97d8bce8a1f93dc4e93b17e840427787629d0b3621a0714266b70cf7cb' 
  AND token = 'x/BEZImTiDj10Ur7aeDq+WYTfUANc8QIQKdrjf+zNGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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