Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b22e8d1e543cba116a5c09c0f62c6060e6b5a23d5a7123dcd4c3c051fca9cc3' 
  AND token = 'gX0rpleof9kzBEgYrMXGWi2s2nBFKB0n5hjTLBZxLQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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