Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b20c717977cc43e273f72d88c0e827c3b2a24eb88ffd5bf6a542ca997edc7d1' 
  AND token = 'H4hI8ImEDB0EfIlLvJwyiCzAgLEIViwaz1J6E2p4Caw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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