Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2fb03debd1df3eb16961f35e36d5975e1ac5c037d3c3f3f17428185624efba26' 
  AND token = 'tjjukhJzGszECnHzvT2edJfDi5TMpzEwGBx5x7db0p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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