Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6301d676ffa9a03414bcb1c119c1daedd8a9f7d4aeeca9567326f7ce3c1f87a' 
  AND token = 'AAw1sBg+cEcmfwhtM5yjdfqoU0Ioqgi3G0X1KJLfPc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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