Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c16d48680f76af99d235a3534a6bb8238ef6adf2b0e34e351387557e23a98d' 
  AND token = 'nZK8KdIYUUkvCCCsrYTxwdSCEl7BT1usfeLr8SLEguo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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