Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875a41d00fd76c14df2ed940f5d203d712a4c40961cb93e76c19618cf08e28f9' 
  AND token = 'nYC+cgyg5AJs2ORe1BjEC6dl544EDXgRnvzdFOzjxTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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