Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1d7a8b930b4b7318ad06c2380b94de289977a4b4aaee6af6fef98e3291c28d' 
  AND token = 'w+8zU/gRXrMiIBrKDPYbg9KaQ7nA34xnDfh5ZfoU29E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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