Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4544994289736b618bb4bacb055483ac4eec1ea11e23276df4da7e85913a564' 
  AND token = 'setPhDwzAnDOVbeftwmBJph6CQj9JIfDPVScyRayYCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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