Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cadf31ff3ca9a82ddcaaf18eca2a1ac9f8a2c9449d3f4997bc1d71fff09b7b6f' 
  AND token = 'Iaaj64AmRApvxaSup3HOa3UPd327I7RSweQyrizfn+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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