SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '080eb1e96001b33c73f381556fa12f233689fabd549678cb9b31f464e2f12844' 
  AND token = 'QZwh+RSY3gqvvDJSUMaa/udvYNvQ6ix/Nl66LoZiAV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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