Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce8e32f234b72230bc3308e288a06f75ef2518f8ec51f58356501da918e298b' 
  AND token = 'PF8PdQfqPh0Pt6t6PPYz35lm+XoYXqCosxe8QTfXKd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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