Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb91f206dd8a801a9e5493a5c0718da6d3b81a9b9b7518b2cd2501b37a8a485' 
  AND token = 'Q4X7ZcUCOc/HvJo+/m58qTfncIcmvHOd+/Jm5F/xKMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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