Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6c0712e669aaada584e419156943c43ffb69da33df9c0e114d779d18a7a9b6' 
  AND token = 'bjWOvjejKE4ORBUln/xMZShMMRAqu3FB6YZE+iP4pvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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