Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a34a802375e94a6e01d60dd7590dfb0c6b6f9823863c968353853511afa04b1' 
  AND token = 'gDmAKuzjRuoIZEP9UV7UI5xnHTfTTLbMc4ZOVv1KC68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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