Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286ff2f4254a076412dbffcd4460382dc30f36bcab659a2b79477984c0ea4a76' 
  AND token = 'lb4APxHWLd/b5ZwTKktDHVifappvIWZheRk4CBmZDL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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