SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59fb689e51cfa7296bd91e6ebd57c4308de6d31a56d07d9804f29f30205aed0b' 
  AND token = 'VDE/F1KL0mgzflV6zpzElTcesZXAtAloKX9eu7Yr+D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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