SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f2f206a90993f458e731b6ae2105aca896b68aea00689612507892cd6647576c' 
  AND token = '1/qwyzSLdfjO3qrWR7LZYuOcs/HQz5SePG1JUI9ts94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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