Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8353d5f6098e565e87093b0789304553fb56f07d29bf138f2c4a38bd0660c4a' 
  AND token = '8eRky++13FDgeNGPwp1xC2jurO3O+1oFFFR7k1ve9cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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