Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd71220e87e0443817833e618307e8f1b2360450ad6d0e02ba53a937e29ec4fc8' 
  AND token = 'z75XoI+LJp43ObHYO5GEwFQAxxjescUipnHIrKpLt2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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