Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe3610282a6ed7bef9d2e348e23d8987e7bec17bc4b7df1d75721c5a6db7f1c' 
  AND token = 'BbCPd9x5ijJ0WXAS2L5bZzr+CBBEBdhTW7gDLw6RtcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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