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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fdf3ddcef37b0a99e0774ba7b35dac3f7f3cfa18233e36104dc087e7fc943c4' 
  AND token = '5d3Wo9pg4OoLYnW0J1YqSiz/+KiADKh08QEaMH48Z5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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