Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82121e00bea9887f0c44f07e03454f7398774f3d94d684eb7fc014d41833cebe' 
  AND token = 'BW6yMOzpR/ObjjjIDSZ8pFI1xww5Dfvs3XX0qP2Y2kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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