Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46fb0b8158127a4bfab46732be94878a8abd2ef1f2f40f09f2fb532795366ce5' 
  AND token = 'BJz5SB8LPNpQSN3B9ExTSPAe4dK9Erc6NxFUMXDWsZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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