Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a12ff802d60dff7591ad1c14561b4f67741057588391701cce3f36303766fe3' 
  AND token = 'JeG18qIuS8csVPzbU2GiQJWG4fj+A8tL+pRytRFSrM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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