Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8e50eb29a4217585162b154fd5384088be4817012818ef4d3d92e8920c2bb2' 
  AND token = '3ZosHWeHZouTDldjByOieZT8K5RUjYQsZyUZ9LrIMrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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