Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '351fee612b46c7acd379be801f9e43962a048b159f8dd70043608adf2f9bb531' 
  AND token = '5l5cs14f1dIaaSBMd3uhL0/wDbppcGp9rmnT+EuX0XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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