Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de8a69664e2b7c07f5613900293d6c96920b5335a0ff62415674186c0b336ba0' 
  AND token = 'KvWgHz5vhq28Neq8fdadZfganc6DizvRoPo83P4xwy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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