Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'affefbb81d8fa2d1953ac14f62005850602b7b9eaaeef3e1aeb87e03dd7cc196' 
  AND token = 'q8MSscXNC9AkBCx0sptHYI5gi2bM7Kq+rRXoNznFSlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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