Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91ca28b63114534066433490ae7151e204ea6559e8655e120d24371b55a62f51' 
  AND token = 'ZNNWGUS+PUPAu0NguT6A/1OGA4CtP9vQwSSmxmZhzTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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