Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26843cf3348bbe5eaa6ab4e993ec92dacdc5db8b9dfb20f562e674e219ff40a8' 
  AND token = 'FDrri4kbSs+ZS6ciPHe/bPr1X/HwgZuZAj2QSjXtW1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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