Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2a468cf635c44cf9f7ac35f2ed31763ec129eaf6ddb99a67c1ea7a5835eca4b1' 
  AND token = 'ftbrev6LjJgG98KpPK0zqZmpTK5vdO3EQJkTyFXaM3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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