Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d37ad9d212d4525fd4bc15aed712019a9b640295c6ab36fe2f3cafe7ee58327' 
  AND token = 'i3QRjFNMkGutZIg9Zv/HIdLpgZ3CmEi9PDwlrU8uUtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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