Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f0c2c7e2dce585e0890e697e2b7ee242d3da44ad8fae579d7c95303dfed574' 
  AND token = 'SzBwkELM5P63UZUeK57vmPqFOIA/8by5eBuPadyPy+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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