Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50391acf9494ca64a0b1b92457b1243986ecda6b77e63442f9e958b22f5ad33a' 
  AND token = 'EapQXzdP80uRv2YR3KFPa4ULpRwhaT95sdYTvZ23IiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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