Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d307509c7ef2cca0c70089de27513c6af79a69924d7e13d2c374ad4adcce4f' 
  AND token = 'G/OEXTdwb6KOxg9wzL+iK64RpYNjwivncfT0ILPPp9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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