Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0cd28826df31105b772164d586cb6cc3f79706b5b919e7f7b738d11af5731510' 
  AND token = '5BNBPc5OGqge5orEWg+Haj04rha3OIJ8ELsI/GL13hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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